Method for producing el display device and transfer substrate used in producing el display device

Abstract

A method for manufacturing an EL display device, in which forming of light-emitting layers includes: preparing transfer substrates, each transfer substrate having a supporting substrate on which a transfer layer including at least red, green, or blue light-emitting material is formed; and performing a transfer process that includes transferring the corresponding transfer layer onto a transfer-target substrate of the EL display device by using the corresponding transfer substrate, each transfer substrate has barrier walls on the supporting substrate thereof, the barrier walls defining openings corresponding to a pixel pattern, and the transfer layer is formed by applying organic material ink to between the barrier walls by an inkjet method, the organic material ink containing the light-emitting material, and the top surface of each of the barrier walls has a protrusion that comes into contact with a corresponding one of banks of the EL display device.

1 . A method for manufacturing an EL display device, the EL display device comprising: a light-emitter that emits light of at least red, green, and blue colors; and a thin-film transistor array device that controls light-emission of the light-emitter, the light-emitter including at least red, green, and blue light-emitting layers arranged within regions partitioned by banks, and being sealed with a sealing layer, wherein
 forming of the light-emitting layers comprises:
 preparing transfer substrates, each transfer substrate having a supporting substrate on which a transfer layer including at least one of red, green, and blue light-emitting materials is formed; and 
 performing a transfer process that comprises transferring the corresponding transfer layer onto a transfer-target substrate of the EL display device by using the corresponding transfer substrate, wherein 
   each transfer substrate has barrier walls on the supporting substrate thereof, the barrier walls defining openings corresponding to a pixel pattern, and the transfer layer is formed by applying organic material ink with respect to the openings by an inkjet method, the organic material ink containing the light-emitting material, and   the top surface of each of the barrier walls has a protrusion that comes into contact with the corresponding one of the banks.   
     
     
         2 . The method of  claim 1 , wherein
 the transfer substrates are of at least three types corresponding to red, green, and blue colors, and the transfer layer is formed on the supporting substrate of each of the transfer substrates by an ink jet method, the transfer layer including at least one of red, green, and blue light-emitting materials, and   when forming the light-emitting layers, the transfer process that comprises transferring the corresponding transfer layer onto the transfer-target substrate of the EL display device is repeatedly performed by using the corresponding transfer substrate.   
     
     
         3 . The method of  claim 2 , wherein
 each of the transfer substrates corresponding to red, green, and blue colors is formed by forming a plurality of photothermal conversion layers that correspond to a red, green, or blue pixel pattern and that generate heat when absorbing laser light, forming barrier walls defining an opening above each of the photothermal conversion layers, and then applying organic material ink with respect to the opening by an inkjet method, and   the transfer process comprises positioning the corresponding transfer substrate relative to the transfer-target substrate of the EL display device, and then irradiating the corresponding transfer substrate with laser light from the direction of the supporting substrate to sublimate or evaporate the corresponding transfer layer, thereby forming the corresponding light-emitting layer in between the banks, the transfer process being repeatedly performed to transfer said at least red, green, and blue light-emitting layers one by one.   
     
     
         4 . A transfer substrate used in manufacturing an EL display device, comprising:
 a substrate;   a plurality of barrier walls disposed at intervals on the substrate, wherein   the transfer substrate further comprises a transfer layer formed by ejecting light-emitting material to a region between every two adjacent barrier walls of the plurality of barrier walls by an inkjet method,   each of the barrier walls has a protrusion on a top surface thereof, and   when the transfer substrate is positioned to transfer the light-emitting material of the transfer layer to a region between every two adjacent banks of a transfer-target substrate, each protrusion is located to face a top surface of the corresponding bank of the transfer-target substrate.